STILL OVERHEATING LOSING A LITTLE WATER SOME WHERE

1991 Toyota Pickup • 126,000 miles

I have replaced the water pump thermostat radiator all hoses head gasket timing chain cover and timing chain there is no blockage in heater coil no water coming through exhaust please someone give me an idea of what it could be?

Were all those parts bad or was that how you tried to diagnose a problem? Were you losing coolant before all those parts were replaced?

If the leak is too small to find by pressurizing the system you might consider adding a small bottle of dark purple dye to the coolant. Drive the truck long enough for some coolant to be lost, then you search with a black light. The dye will show up as a bright yellow stain that you can follow back to the source. Don't overlook a leaking heater core. Dye will show up inside the condensate drain hose if the truck came with air conditioning.

I replace the water pump because it was weeping had a crack in the radiator and the thermostat was not opening so I replace that. It was fine for a while and then it started to over heat and spit oil through the radiator but oil was fine no water that is when I heard about timing chain could possibly rub hole inthe timing cover sure enough I replaced the timing cover which meant I had to remove head and replace that gasket but had two teeth shear off cam sprocket and the guides were broke but thanks for the advice will try dye trick will keep you updated appreciate the fast response.